CN112117108B - Resin-cast dry-type transformer with high-voltage coil structure - Google Patents
Resin-cast dry-type transformer with high-voltage coil structure Download PDFInfo
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- CN112117108B CN112117108B CN202010992604.4A CN202010992604A CN112117108B CN 112117108 B CN112117108 B CN 112117108B CN 202010992604 A CN202010992604 A CN 202010992604A CN 112117108 B CN112117108 B CN 112117108B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
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Abstract
The invention relates to a resin-cast dry-type transformer with a high-voltage coil structure, which comprises: the transformer comprises a plurality of groups of transformers, each transformer comprises a high-voltage coil, a low-voltage coil and an insulating sleeve, and the insulating sleeves are arranged in adjacent coils of the high-voltage coils and used for avoiding direct contact of wires between two adjacent layers of the high-voltage coils; the life of extension transformer, the real-time voltage of transformer is big, the heat of production will be more, long service life, the heat of production also can increase, if the real-time voltage of transformer is big, the heat of production is many, then because of the consideration of security, can reduce the use priority of this transformer, it is little when the real-time voltage of transformer, the heat of production is few, then can improve its use priority according to actual need, the preferred alternative uses, make the use scheduling of transformer more intelligent, and can wholly improve the safety in utilization of transformer bank, reduce and produce unexpected coefficient such as fire and overflow, the life of extension transformer bank.
Description
Technical Field
The invention relates to the field of power equipment, in particular to a resin-cast dry-type transformer with a high-voltage coil structure.
Background
A large number of resin-cast dry-type transformers are popularized and adopted in a power grid, but the main insulation structure of the resin-cast dry-type transformers is unchanged for many years, the main insulation structure is resin and air, the 10-35kV epoxy resin dry-type transformers which are generally produced and used at present meet the standard requirements of power frequency voltage resistance and lightning impulse, the distance between a high-voltage main air channel and a low-voltage main air channel is 33-95mm, the phase distance is 33-95mm, and the distance between the end face of a coil and an iron core is 40-60 mm; the structure prevents the optimal design of the resin dry-type transformer, the volume and the material consumption of the transformer can not be reduced, and the dry-type transformer is a hard damage in the industry.
The creepage phenomenon exists on the surface of the high-voltage coil when the dry type transformer operates, the reason is that the humidity of the use environment is high, the dirt and waste level is high, the surface of the high-voltage coil is affected with damp, a conductive bridge is formed, the creepage is a hidden trouble of safe operation of the transformer, and the transformer can be burnt in serious cases.
Meanwhile, in the manufacturing process of the product, an insulating cylinder is needed between high-voltage and low-voltage coils, the existing dry-type transformer product adopts a soft die, the radial size and the axial size of the soft die have certain deviation, the radial size and the axial size are difficult to reach the complete consistency, the assembling of the insulating cylinder is difficult, meanwhile, the local part of the insulating cylinder is close to the surface of high voltage or low voltage, the local temperature rise is overhigh, and the cost of the insulating cylinder is not low.
Disclosure of Invention
Therefore, the resin-cast dry-type transformer with the high-voltage coil structure can effectively prevent the breakdown of the insulating sleeve and effectively protect the service life of the transformer.
To achieve the above object, the present invention provides a resin-cast dry type transformer provided with a high-voltage coil structure, comprising: the transformer comprises a plurality of groups of transformers, each transformer comprises a high-voltage coil, a low-voltage coil and an insulating sleeve, and the insulating sleeves are arranged in adjacent coils of the high-voltage coils and used for avoiding direct contact of wires between two adjacent layers of the high-voltage coils; the surface of the insulating sleeve is provided with an automatic cleaning device, and when the cleanness degree of the surface of the insulating sleeve does not reach a preset standard, the automatic cleaning device is started to clean the insulating sleeve; the automatic cleaning device further comprises a central control unit, the central control unit is respectively connected with the transformer and the automatic cleaning device, a standard voltage matrix U (U1, U2, U3 and U4) of the high-voltage coil is arranged in the central control unit, U1 represents first standard voltage, U2 represents second standard voltage, U3 represents third standard voltage, U4 represents fourth standard voltage, and the first standard voltage U1> the second standard voltage U2> the third standard voltage U3> the fourth standard voltage U4; when the voltage on the high-voltage coil is U1i > a first standard voltage U1 at the ith moment, detecting the current real-time temperature T1i of the high-voltage coil, if the real-time temperature is higher than a preset safe temperature TO, detecting the current real-time humidity Wi of the high-voltage coil, if the real-time humidity is greater than a preset first safe humidity W1, immediately starting the automatic cleaning device on the high-voltage coil, cleaning an insulating sleeve of the current high-voltage coil, and after the cleaning time is T1, enabling the real-time humidity of the insulating sleeve TO be between a preset first safe humidity W1 and a preset second safe humidity W2, and outputting a transformer where the current high-voltage coil is located as a fourth output; when the voltage on the high-voltage coil is first standard voltage U1, U1i and second standard voltage U2 at the ith moment, detecting the real-time temperature T1i of the current high-voltage coil, if the real-time temperature is lower than the preset safe temperature TO, starting the automatic cleaning device on the high-voltage coil after T1 time, if the cleaning time is T2, the real-time humidity of the insulating sleeve is lower than first safe humidity W1, if the real-time temperature is higher than the preset safe temperature TO, immediately starting the automatic cleaning device on the high-voltage coil, cleaning the insulating sleeve of the current high-voltage coil, if the cleaning time is T1, the real-time humidity of the insulating sleeve is between the preset first safe humidity W1 and second safe humidity W2, taking the transformer where the current high-voltage coil is located as a third output, and when the ith moment, the voltage of the high-voltage coil is second standard voltage U2, U1i and third standard voltage U3, the current real-time temperature T1i of the high-voltage coil is detected, if the real-time temperature is lower than preset safe temperature TO, the automatic cleaning device on the high-voltage coil is started after T1+ T2 time, after the cleaning time is T3, the real-time humidity of the insulating sleeve is lower than first safe humidity W1, if the real-time temperature is higher than the preset safe temperature TO, the automatic cleaning device on the high-voltage coil is started immediately TO clean the insulating sleeve of the current high-voltage coil, after the cleaning time is T3, the real-time humidity of the insulating sleeve is between the preset first safe humidity W1 and second safe humidity W2, the transformer where the current high-voltage coil is located is used as second output, at the ith moment, the voltage on the high-voltage coil is third standard voltage U3U 1i U4, then the current real-time temperature T1i of the high-voltage coil is detected, if the real-time temperature is lower than the preset safe temperature TO, the automatic cleaning device on the high-voltage coil is started after T1+ T2+ T3 time, after the cleaning time is T4, the real-time humidity of the insulating sleeve is lower than first safe humidity W1, if the real-time temperature is higher than the preset safe temperature TO, the automatic cleaning device on the high-voltage coil is started immediately, after the cleaning time is T4, the real-time humidity of the insulating sleeve is between the preset first safe humidity W1 and second safe humidity W2, the transformer where the current high-voltage coil is located serves as a first output, at the ith moment, the voltage on the high-voltage coil is fourth standard voltage U4U 1i, detecting the real-time temperature T1i of the current high-voltage coil, if the real-time temperature is lower than the preset safe temperature TO, starting the automatic cleaning device on the high-voltage coil after the time of T1+ T2+ T3+ T4 TO clean the insulating sleeve of the current high-voltage coil, and if the real-time temperature is higher than the preset safe temperature TO, immediately starting the automatic cleaning device on the high-voltage coil, and selecting the current transformer TO work as the zeroth output; and the central control unit sequentially outputs voltage according to the sequence of the zeroth output, the first output, the second output, the third output and the fourth output.
Further, when the zero-output transformer is used, if the temperature of the zero-output transformer is increased TO 1.1 × TO after working for a preset time period, the output of the zero-output transformer is stopped, the real-time humidity of the zero-output transformer is detected, if the real-time humidity is between a preset first safety humidity W1 and a preset second safety humidity W2, the zero-output voltage transformer is replaced TO a first output, if the real-time humidity is greater than the second safety humidity W2, the zero-output voltage transformer is replaced TO a second output, and if the real-time humidity is lower than the preset first safety humidity W1, the zero-output transformer is replaced TO a third output.
Further, when the transformer with the first output is used, if the temperature of the transformer with the first output is increased TO 1.2 × TO after working for a preset time period, the output of the transformer with the first output is stopped, the real-time humidity of the transformer with the first output is detected, if the real-time humidity is between a preset first safety humidity W1 and a preset second safety humidity W2, the voltage device with the first output is replaced TO the second output, if the real-time humidity is greater than the second safety humidity W2, the voltage device with the first output is replaced TO the third output, and if the real-time humidity is lower than the preset first safety humidity W1, the transformer with the first output is replaced TO the fourth output.
Further, when the transformer with the second output is used, if the temperature of the transformer with the second output is increased TO 1.3 × TO after working for a preset time period, the output of the transformer with the second output is stopped, the real-time humidity of the transformer with the second output is detected, if the real-time humidity is between a first preset safety humidity W1 and a second preset safety humidity W2, the voltage device with the second output is replaced TO a third output, if the real-time humidity is greater than the second safety humidity W2, the voltage device with the second output is replaced TO the third output, if the real-time humidity is lower than the first preset safety humidity W1, the transformer with the second output is replaced TO a fourth output, and the high-voltage coil is a flat enameled copper wire.
Furthermore, the central control unit is connected with the temperature sensor and used for judging the safety of the transformer according to the real-time temperature of the temperature sensor;
when the transformer with the fourth output is used, if the temperature of the transformer with the fourth output is increased TO 1.6 × TO after the transformer works for a preset time, the output of the transformer with the fourth output is stopped, the real-time humidity of the transformer with the fourth output is detected, if the real-time humidity is between a preset first safety humidity W1 and a preset second safety humidity W2, the voltage device with the fourth output is replaced TO the first output, if the real-time humidity is greater than the second safety humidity W2, the voltage device with the fourth output is replaced TO the second output, and if the real-time humidity is lower than the preset first safety humidity W1, the transformer with the fourth output is replaced TO the third output.
Furthermore, the number of turns of the high-voltage coil is 50, the insulating sleeve is a resin pouring layer, and the low-voltage coil adopts a foil winding.
Further, the number of turns of the low-voltage coil is 20.
Further, the high voltage coil has a layer spacing smaller than that of the low voltage coil.
Compared with the prior art, the resin-cast dry-type transformer with the high-voltage coil structure provided by the invention has the advantages that the standard voltage matrix U (U1, U2, U3 and U4) arranged in the central control unit is compared with the real-time voltage, the use sequence of the transformer is adjusted according to the range of the real-time voltage, and a person skilled in the art can understand that when a plurality of groups of transformers are available for selection, the real-time voltage of the transformer is high, the generated heat is more, the use time is long, the generated heat is increased, if the real-time voltage of the transformer is high, the generated heat is more, the use priority of the transformer is reduced due to the consideration of safety, when the real-time voltage of the transformer is low, the generated heat is low, the use priority of the transformer can be improved according to actual needs, the transformer is preferentially selected for use, so that the use scheduling of the transformer is more intelligent, and the use safety of the transformer bank can be integrally improved, the accidental coefficients of fire, overcurrent and the like are reduced, and the service life of the transformer bank is prolonged.
When the real-time voltage is compared, the real-time temperature and the real-time humidity of the transformer are also considered, the use sequence of the transformer is selected according to the real-time voltage, the real-time temperature and the real-time humidity, the use sequence of the transformer is selected according to the sequence of the zeroth output, the first output, the second output, the third output and the fourth output, if the real-time temperature is lower than the standard temperature, the priority is higher, if the real-time temperature is higher than the standard temperature, the humidity on the high-voltage coil is required to be used for cooling so as to enable the transformer to meet the standard lower than the standard temperature, and the use sequence is recovered. The real-time temperature of the transformer can be changed, the output sequence of each transformer is a dynamic change process under the influence of each factor parameter, the output sequence of the transformer is selected according to the real-time change parameter, the used transformer can be guaranteed to be the transformer with higher safety coefficient, the sequence in real-time change can be intelligently selected in the central control unit, and the surface of the insulating sleeve can be used for being provided with an automatic cleaning device to further adjust the humidity of the high-voltage coil, so that the resin-cast dry-type transformer with the high-voltage coil structure provided by the embodiment of the invention has higher safety performance, meets the requirement, reduces the frequency of fire and overcurrent in the use process, and prolongs the service life.
The invention has the advantages that the breakdown and the like of the insulating sleeve caused by environmental pollution and the like are effectively prevented, the high-voltage coil and the low-voltage coil are further protected, and the service life of the transformer is prolonged.
Drawings
Fig. 1 is a schematic structural view of a resin-cast dry-type transformer provided with a high-voltage coil structure according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, an embodiment of the present invention provides a resin-cast dry-type transformer with a high-voltage coil 10 structure, including: the transformer comprises a plurality of groups of transformers, each transformer comprises a high-voltage coil 10, a low-voltage coil 20 and an insulating sleeve 30, and the insulating sleeves 30 are arranged in adjacent coils of the high-voltage coils 10 and used for avoiding direct contact of wires between two adjacent layers of the high-voltage coils 10; an automatic cleaning device is arranged on the surface of the insulating sleeve 30, and when the cleanness degree of the surface of the insulating sleeve 30 does not reach a preset standard, the automatic cleaning device is started to clean the insulating sleeve 30; the automatic cleaning device further comprises a central control unit, the central control unit is respectively connected with the transformer and the automatic cleaning device, a standard voltage matrix U (U1, U2, U3 and U4) of the high-voltage coil 10 is arranged in the central control unit, U1 represents a first standard voltage, U2 represents a second standard voltage, U3 represents a third standard voltage, U4 represents a fourth standard voltage, the first standard voltage U1> the second standard voltage U2> the third standard voltage U3> the fourth standard voltage U4, when the voltage on the high-voltage coil 10 is U1i > the first standard voltage U1 at the ith moment, the current real-time temperature T1i of the high-voltage coil 10 is detected, if the real-time temperature is higher than a preset safe temperature TO, the current real-time humidity Wi of the high-voltage coil 10 is detected, and if the real-time humidity is higher than a preset safe temperature W1, the automatic cleaning device on the high-voltage coil 10 is started immediately, cleaning the insulation sleeve 30 of the current high-voltage coil 10, wherein after the cleaning time is t1, the real-time humidity of the insulation sleeve 30 is between a preset first safety humidity W1 and a preset second safety humidity W2, and the transformer where the current high-voltage coil 10 is located is used as a fourth output; when the voltage of the high-voltage coil 10 is the first standard voltage U1, U1i and the second standard voltage U2 at the ith moment, detecting the real-time temperature T1i of the current high-voltage coil 10, if the real-time temperature is lower than the preset safe temperature TO, starting the automatic cleaning device on the high-voltage coil 10 after T1 time, if the cleaning time is T2, the real-time humidity of the insulating sleeve 30 is lower than the first safe humidity W1, if the real-time temperature is higher than the preset safe temperature TO, immediately starting the automatic cleaning device on the high-voltage coil 10, cleaning the insulating sleeve 30 of the current high-voltage coil 10, if the cleaning time is T1, the real-time humidity of the insulating sleeve 30 is between the preset first safe humidity W1 and the second safe humidity W2, taking the transformer where the current high-voltage coil 10 is located as a third output, and when the ith moment, the voltage of the high-voltage coil 10 is second standard voltage U2, U1i and third standard voltage U3, then the real-time temperature T1i of the high-voltage coil 10 is detected, if the real-time temperature is lower than the preset safe temperature TO, the automatic cleaning device on the high-voltage coil 10 is started after T1+ T2 time, after the cleaning time is T3, the real-time humidity of the insulating sleeve 30 is lower than the first safe humidity W1, if the real-time temperature is higher than the preset safe temperature TO, the automatic cleaning device on the high-voltage coil 10 is started immediately, the insulating sleeve 30 of the high-voltage coil 10 is cleaned, after the cleaning time is T3, the real-time humidity of the insulating sleeve 30 is between the preset first safe humidity W1 and the second safe humidity W2, a transformer where the high-voltage coil 10 is located at present is used as a second output, at the ith moment, the voltage on the high-voltage coil 10 is a third standard voltage U3> U1i > a fourth standard voltage U4, a current real-time temperature T1i of the high-voltage coil 10 is detected, if the real-time temperature is lower than a preset safe temperature TO, the automatic cleaning device on the high-voltage coil 10 is started after time T1+ T2+ T3, after the cleaning time is T4, the real-time humidity of the insulating sleeve 30 is lower than a first safe humidity W1, if the real-time temperature is higher than the preset safe temperature TO, the automatic cleaning device on the high-voltage coil 10 is started immediately, after the cleaning time is T4, the real-time humidity of the insulating sleeve 30 is between the preset first safe humidity W1 and a second safe humidity W2, a transformer where the current high-voltage coil 10 is located is used as a first output, and at the ith moment, the voltage on the high-voltage coil 10 is the fourth standard voltage U4> U1i, detecting a real-time temperature T1i of the current high-voltage coil 10, if the real-time temperature is lower than a preset safe temperature TO, starting the automatic cleaning device on the high-voltage coil 10 after T1+ T2+ T3+ T4 time TO clean the insulating sleeve 30 of the current high-voltage coil 10, and if the real-time temperature is higher than the preset safe temperature TO, immediately starting the automatic cleaning device on the high-voltage coil 10 TO select a current transformer TO work as a zeroth output; and the central control unit sequentially outputs voltage according to the sequence of the zeroth output, the first output, the second output, the third output and the fourth output.
In the resin-cast dry-type transformer with the high-voltage coil 10 structure provided by the embodiment of the invention, the standard voltage matrix U (U1, U2, U3 and U4) arranged in the central control unit is compared with the real-time voltage, and the use sequence of the transformers is adjusted according to the range of the real-time voltage, so that a person skilled in the art can understand that when a plurality of groups of transformers are available for selection, the real-time voltage of the transformers is high, the generated heat is more, the use time is long, the generated heat is increased, if the real-time voltage of the transformers is high, the generated heat is more, the use priority of the transformers is reduced due to the consideration of safety, when the real-time voltage of the transformers is low, the generated heat is low, the use priority of the transformers can be improved according to actual needs, the transformers are preferentially selected for use, and the use scheduling of the transformers is more intelligent, and the use safety of the transformer bank can be integrally improved, the accidental coefficients of fire, overcurrent and the like are reduced, and the service life of the transformer bank is prolonged.
Further, when comparing the real-time voltage, the real-time temperature and the real-time humidity of the transformer need to be considered, the using sequence of the transformer is selected according to the real-time voltage, the real-time temperature and the real-time humidity, the using sequence of the transformer is selected according to the sequence of the zeroth output, the first output, the second output, the third output and the fourth output, if the real-time temperature is lower than the standard temperature, the priority is higher, if the real-time temperature is higher than the standard temperature, the humidity on the high-voltage coil 10 needs to be used for cooling so as to enable the high-voltage coil to meet the standard lower than the standard temperature, and the using sequence is recovered. The real-time temperature of the transformer affects its real-time humidity, which also changes its real-time temperature, under the influence of each factor parameter, the output sequence of each transformer is also a dynamic change process, the embodiment of the invention selects the output sequence of the transformers according to the parameters changing in real time, can ensure that the used transformers are the transformers with higher safety coefficient, can intelligently select the sequence changing in real time in the central control unit, can further adjust the humidity of the high-voltage coil 10 by utilizing the automatic cleaning device arranged on the surface of the insulating sleeve 30, the resin-cast dry-type transformer with the high-voltage coil 10 structure provided by the embodiment of the invention has higher safety performance, meets the requirement, reduces the frequency of fire and overcurrent in the use process, and prolongs the service life.
Specifically, after the transformer with the zeroth output works for a preset time, the temperature of the transformer with the zeroth output rises TO 1.1 × TO, the output of the transformer with the zeroth output is stopped, the safety of the transformer in use is ensured, the transformer is prevented from being damaged by high temperature caused by high voltage, the real-time humidity of the transformer with the zeroth output is detected, if the real-time humidity is between a preset first safety humidity W1 and a preset second safety humidity W2, if the real-time humidity is higher, the transformer can be cooled by utilizing the humidity, the danger coefficient is lower, the voltage device with the zeroth output is replaced TO the second output, the use sequence of the voltage device is reduced, but the use sequence is not reduced greatly, the voltage device with the zeroth output can still be used preferentially, if the real-time humidity is lower than the preset first safety humidity W1, if the real-time humidity is very low, the temperature of the voltage device cannot be reduced by utilizing the humidity, the use sequence of the voltage device with the zeroth output is replaced TO the third output, further ensuring the safety of use.
Specifically, when in use, if the temperature of the transformer of the first output rises TO 1.2 × TO after working for a preset time period, since the real-time voltage of the transformer of the first output is lower than the real-time voltage of the transformer of the zeroth output, the temperature threshold of the transformer of the first output can be appropriately raised, when the temperature of the transformer of the first output rises TO 1.2 × TO, the output of the transformer of the first output is stopped, and the real-time humidity of the first transformer is detected, if the real-time humidity is between a preset first safe humidity W1 and a second safe humidity W2, the voltage device of the first output is replaced TO the second output, the temperature of the transformer is reduced by using the humidity, the safety in use of the transformer is ensured, as the humidity of the transformer is reduced along with the reduction of the temperature, the transformer tends TO a normal use range, the use priority of the transformer is appropriately reduced as the second output, and if the real-time humidity is greater than the second safe humidity W2, if the humidity is large, a part of humidity is used when the temperature is reduced, but the original humidity is large, the temperature is still dangerous after being reduced, at the moment, the use priority of the transformer needs to be reduced, the transformer is classified as the third output, if the real-time humidity is lower than a preset first safety humidity W1, the transformer of the first output is replaced to the third output, the humidity of the transformer is low, the temperature of the transformer cannot be reduced, the transformer is extremely easy to heat, the danger of fire and overcurrent of the transformer is large, the use priority of the transformer needs to be further reduced, the safety of the transformer in the use sequence is further ensured, and the danger is effectively avoided.
When the transformer with the second output is used, if the temperature of the transformer with the second output is increased TO 1.3 × TO after working for a preset time, because the real-time voltage of the transformer with the second output is lower than the real-time voltage of the transformer with the first output, the temperature threshold of the transformer with the second output can be properly increased, when the temperature of the transformer with the second output is increased TO 1.3 × TO, the output of the transformer with the second output is stopped, the real-time humidity of the second transformer is detected, if the real-time humidity is between a preset first safe humidity W1 and a preset second safe humidity W2, the voltage device with the second output is replaced TO a third output, the voltage device with the second output is cooled by using humidity, the use safety of the voltage device is ensured, the humidity of the transformer is also reduced along with the reduction of the temperature, the transformer tends TO a normal use range, the voltage device with the second output is used as the third output, the use priority level of the third output is properly reduced, and if the real-time humidity is higher than the second safe humidity W2, if the humidity is large, a part of humidity is used when the temperature is reduced, but the original humidity is large, the temperature is still dangerous after being reduced, at the moment, the use priority of the transformer needs to be reduced, the transformer is classified as the third output, if the real-time humidity is lower than the preset first safe humidity W1, the transformer of the third output is replaced to the fourth output, the humidity of the transformer is low, the temperature of the transformer cannot be reduced, the transformer is extremely easy to heat, the danger of fire and overcurrent of the transformer is large, the use priority of the transformer needs to be further reduced, the safety of the transformer in the use sequence is further ensured, and the danger is effectively avoided.
Specifically, the central control unit is connected with the temperature sensor and used for judging the safety of the transformer according to the real-time temperature of the temperature sensor; when the transformer with the fourth output is used, if the temperature of the transformer with the fourth output is increased TO 1.6 × TO after the transformer works for a preset time, the output of the transformer with the fourth output is stopped, the real-time humidity of the transformer with the fourth output is detected, if the real-time humidity is between a preset first safety humidity W1 and a preset second safety humidity W2, the voltage device with the fourth output is replaced TO the first output, if the real-time humidity is greater than the second safety humidity W2, the voltage device with the fourth output is replaced TO the second output, and if the real-time humidity is lower than the preset first safety humidity W1, the transformer with the fourth output is replaced TO the third output. For the output of the fifth sequence, the use frequency is lower, the possibility of damage is not high, therefore, when the transformer is used, the output can be improved to the first output, the second output and the third output according to actual needs, the requirement for the sequence change is lower, the use condition of the whole transformer bank is more intelligent, the output condition of the transformer bank is reasonably distributed, and the electric energy utilization rate of the transformer bank is improved.
Specifically, the number of turns of the high-voltage coil 10 is 50, the insulating sleeve 30 is a resin casting layer, and the low-voltage coil 20 adopts a foil winding. Specifically, the low voltage coil 20 has 20 turns.
Specifically, the high voltage coil 10 has a smaller interlayer distance than the low voltage coil 20. The surface of the insulating sleeve 30 is provided with an automatic cleaning device, and when the cleanness degree of the surface of the insulating sleeve 30 does not reach a preset standard, the automatic cleaning device is started to clean the insulating sleeve 30 so as to enable the surface of the insulating sleeve 30 to reach the preset standard, so that the breakdown and the like of the insulating sleeve 30 caused by environmental pollution and the like are effectively prevented, the high-voltage coil 10 and the low-voltage coil 20 are further protected, and the service life of the transformer is prolonged.
Specifically, the insulating layer is a resin cast layer. The resin casting layer is adopted as the insulating sleeve 30, so that the processing and manufacturing are easy, the process is simple, the realization is easy, and the production and the processing are convenient. The insulating assembly is arranged between every two adjacent layers of high-voltage coils 10, so that the direct contact of the wires between the two adjacent layers of high-voltage coils 10 can be avoided, the insulating strength of the coil structure can be effectively increased, and the phenomenon that the high-voltage coils 10 are burnt due to the fact that insulating materials are broken down is reduced.
Specifically, the low-voltage coil 20 employs a foil winding. Specifically, the high-voltage coil 10 is an enameled rectangular copper wire.
Specifically, the high-voltage coil 10 adopts a wire-wound cylindrical structure, and the low-voltage coil 20 adopts a foil structure. Foil structures are used more often in dry distribution transformers. The coil with the low-voltage foil type structure does not need the process flows of die filling, pouring, curing and the like, a layer of insulating material needs to be wound between layers in the winding process, and the wound layer is heated, cured and formed. The foil type coil is high in production efficiency and good in manufacturability, and can reduce transverse magnetic flux leakage, reduce axial electrodynamic force, improve short-circuit resistance and reduce additional loss.
Specifically, the transformer further comprises an iron core, wherein the iron core comprises a first arm and a second arm, the high-voltage coil 10 is wound on the first arm, the low-voltage coil 20 is wound on the second arm, and the diameter of the iron core is 290-300 mm.
Specifically, temperature sensors are disposed on the high voltage coil 10 and the low voltage coil 20, and are used for detecting real-time temperatures of the first arm and the second arm.
Specifically, the temperature rise is controlled by adjusting the total loss of the transformer, so that the transformer can run more efficiently, and the safety of the transformer and the reduction of the total loss of the transformer are ensured.
Specifically, the transformer safety monitoring system further comprises a central control unit, wherein the central control unit is connected with the temperature sensor and used for judging the safety of the transformer according to the real-time temperature of the temperature sensor.
The temperature of the transformer is monitored in real time through the central control unit, the working temperature of the transformer is guaranteed to be within a preset range, if the working temperature of the transformer exceeds the preset range, the power consumption of the transformer can be reduced, the working temperature of the transformer is recovered to be within a normal range, the power consumption of the transformer is improved, and balance between the working temperature and the power consumption is achieved.
Specifically, the high voltage coil 10 has 50 turns, and the low voltage coil 20 has 20 turns.
For a transformer made of copper, a coil of a "slim" type is relatively inexpensive compared to a coil of a "slim" type. Because copper is more expensive than silicon steel sheets, a "squat" coil generally has fewer turns. However, copper is also used less, and the electric density rises accordingly. Therefore, on the premise of ensuring that the magnetic density of the iron core does not exceed 1.65T, the consumption of the silicon steel sheets is correspondingly increased. Therefore, compared with a thin and tall transformer, the short and fat transformer uses less copper, but uses more silicon steel sheets, and has lower cost as a whole.
Specifically, the high voltage coil 10 has a smaller interlayer distance than the low voltage coil 20.
The winding is one of the most important features for distinguishing dry-type transformers from other types of transformers, and is also the most important component part of the dry-type transformers. The winding of the epoxy resin cast transformer mainly comprises a conducting wire and an insulating structure. The wire is used for completing the transmission and conversion of electric energy. The primary winding guides the electric energy into the transformer, and the electric energy is transferred to the secondary winding through the electromagnetic accident combined action of the transformer iron core. The secondary winding then transfers the power to the next stage. The basic insulation structure of a dry-type transformer is epoxy resin impregnated in the windings, which functions to insulate and protect the windings from electromagnetic forces and physical impacts. The segmented cylindrical winding needs to ensure that the segmented rationality of the winding and the voltage between segments meet requirements. Meanwhile, the method also requires that good pouring performance and full force of voltage between radiating layers and turn-to-turn voltage are ensured in the design. The distance between the high voltage coil 10 and the low voltage coil 20 determines the magnitude of the heat dissipation performance, and the normality of the operation is ensured.
Specifically, a single-layer cylindrical structure is generally adopted, and a foil winding structure is adopted for a secondary winding (i.e., a low-voltage winding). The single-layer cylindrical structure is a single-spiral structure winding without a radial air passage and is spirally wound by a flat wire. Although the winding has a simple structure and is convenient to wind, the structure of the upper end and the lower end of the winding for outgoing lines easily causes the difficulty in resin sealing when epoxy resin is poured. The research of the subject optimizes the structure, and simultaneously, the production cost is considered to be reduced on the premise of meeting the national standard requirement. The optimized high-voltage winding adopts a double-layer segmented cylindrical structure. The structure has good winding process and strong short circuit resistance, but requires reasonable layering and segmentation, and ensures the matching of interlayer voltage, intersegment voltage and turn voltage with insulation. The double-layer sectional cylindrical structure is formed by spirally winding round wires or flat wires into a plurality of wire layers, and insulating materials and air ducts are arranged between turns of each layer of wires.
Specifically, the epoxy resin cast dry-forming process must be performed through the processes of mold filling, casting, curing, etc. during the production process. In the early development, thick insulation was mostly used for epoxy cast dry-variant cast windings. The thick insulation is epoxy resin added with quartz powder, the thickness of the insulation layer is generally 6-15mm, and most of the insulation layers are B-level insulation. The segmented cylindrical structure is generally used for manufacturing a wire-wound primary side winding, and the interlayer insulation adopts an alkali-free tape, and the end insulation adopts a glass cloth plate. Then, the wound coil is subjected to processes such as die-filling, casting, curing and the like. However, since the epoxy resin and the conductive wire are heated differently, the ring insulation layer is easily cracked when dry-change operation is heated, and the small air gap formed thereby is easily subjected to partial discharge. The galvanic corrosion caused by such localized discharges will also greatly shorten the operational life of the transformer and seriously threaten its operational reliability. Therefore, under the large background that products are continuously updated and new products are developed, the thin insulation structure gradually becomes the mainstream of the products.
Specifically, the high-voltage coil 20 and the low-voltage coil 20 may both have a wound cylindrical structure. The structure is generally applied to high-capacity casting dry transformation, the high-voltage coil 10 generally adopts a segmented cylinder structure, and the low-voltage coil 20 generally adopts a multi-layer cylinder structure.
In particular, the high and low voltage windings may both be foil-type structures. The capacity of such structures is generally not more than 2500kVA and at most not more than 4000 kVA. The high-voltage coil 10 adopts a segmented cylinder type foil structure, and the low-voltage coil 20 adopts a common foil structure. The sectional cylindrical foil coil has high manufacturing difficulty, and manufacturing equipment and production raw materials of the sectional cylindrical foil coil need to meet certain standards, otherwise, the quality of a product can be influenced. The inner film of the high-voltage coil 10 with the winding structure is an epoxy glass cloth tube and is formed by winding on a winding machine, and the low-voltage winding is of a common foil structure. The transformer has large volume, high manufacturing man-hour and low operation reliability, so the market share is very low.
And proper main air ducts, high-voltage coil 20 air ducts, low-voltage coil 20 air ducts, inner layer insulation, end insulation, interlayer insulation, turn insulation, outer layer insulation and the like are distributed to obtain an optimal coil structure, so that the temperature rise and the loss are reduced. Meanwhile, a reasonable wire gauge is selected, the current density is properly reduced, the loss is controlled within the national standard range, and the production cost is minimized.
Specifically, the silicon steel sheet is made of steel with a small amount of silicon added in the smelting process to have the effects of low magnetic leakage and eddy current loss, so that the magnetic permeability and the resistivity of most of the existing transformer iron can be improved, and the iron core is made of the silicon steel sheet. Since the voltage level of the winding is determined, the potential per turn of the winding is mainly determined by the magnetic flux density when the core specifications are determined. The resistance voltage is generally related to the magnetic flux density, the resistance voltage is generally positive with respect to the square of the number of turns of the winding, and the number of turns of the winding is generally inversely proportional to the magnetic flux density. Therefore, when determining the magnetic flux density of the core, it is necessary to consider whether the impedance voltage, the no-load loss, and the no-load current satisfy the design requirements of the transformer.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A resin-cast dry-type transformer provided with a high-voltage coil structure, comprising: the transformer comprises a plurality of groups of transformers, each transformer comprises a high-voltage coil, a low-voltage coil and an insulating sleeve, and the insulating sleeves are arranged in adjacent coils of the high-voltage coils and used for avoiding direct contact of wires between two adjacent layers of the high-voltage coils; the surface of the insulating sleeve is provided with an automatic cleaning device, and when the cleanness degree of the surface of the insulating sleeve does not reach a preset standard, the automatic cleaning device is started to clean the insulating sleeve;
the automatic cleaning device further comprises a central control unit, the central control unit is respectively connected with the transformer and the automatic cleaning device, a standard voltage matrix U (U1, U2, U3 and U4) of the high-voltage coil is arranged in the central control unit, U1 represents first standard voltage, U2 represents second standard voltage, U3 represents third standard voltage, U4 represents fourth standard voltage, and the first standard voltage U1> the second standard voltage U2> the third standard voltage U3> the fourth standard voltage U4;
when the voltage on the high-voltage coil is U1i > a first standard voltage U1 at the ith moment, detecting the current real-time temperature T1i of the high-voltage coil, if the real-time temperature is higher than a preset safe temperature TO, detecting the current real-time humidity Wi of the high-voltage coil, if the real-time humidity is greater than a preset first safe humidity W1, immediately starting the automatic cleaning device on the high-voltage coil, cleaning an insulating sleeve of the current high-voltage coil, and after the cleaning time is T1, enabling the real-time humidity of the insulating sleeve TO be between a preset first safe humidity W1 and a preset second safe humidity W2, and outputting a transformer where the current high-voltage coil is located as a fourth output;
when the voltage on the high-voltage coil is first standard voltage U1, U1i and second standard voltage U2 at the ith moment, detecting the current real-time temperature T1i of the high-voltage coil, if the real-time temperature is lower than the preset safe temperature TO, starting the automatic cleaning device on the high-voltage coil after T1 time, if the cleaning time is T2, the real-time humidity of the insulating sleeve is lower than first safe humidity W1, if the real-time temperature is higher than the preset safe temperature TO, immediately starting the automatic cleaning device on the high-voltage coil, cleaning the insulating sleeve of the current high-voltage coil, if the cleaning time is T1, the real-time humidity of the insulating sleeve is between the preset first safe humidity W1 and second safe humidity W2, and outputting a transformer where the current high-voltage coil is located as a third output;
when the voltage on the high-voltage coil is the second standard voltage U2, U1i and the third standard voltage U3 at the ith moment, detecting the current real-time temperature T1i of the high-voltage coil, if the real-time temperature is lower than the preset safe temperature TO, starting the automatic cleaning device on the high-voltage coil after the time of T1+ T2, if the cleaning time is T3, the real-time humidity of the insulating sleeve is lower than the first safe humidity W1, if the real-time temperature is higher than the preset safe temperature TO, immediately starting the automatic cleaning device on the high-voltage coil, cleaning the insulating sleeve of the current high-voltage coil, if the cleaning time is T3, the real-time humidity of the insulating sleeve is between the preset first safe humidity W1 and the second safe humidity W2, and outputting a transformer where the current high-voltage coil is located as a second output;
when the voltage on the high-voltage coil is a third standard voltage U3, U1i and a fourth standard voltage U4 at the ith moment, detecting the current real-time temperature T1i of the high-voltage coil, if the real-time temperature is lower than a preset safe temperature TO, starting the automatic cleaning device on the high-voltage coil after T1+ T2+ T3 time, if the real-time temperature is higher than the preset safe temperature TO, starting the automatic cleaning device on the high-voltage coil immediately, if the cleaning time is T4, the real-time humidity of the insulating sleeve is lower than a first safe humidity W1, if the real-time temperature is higher than the preset safe temperature TO, starting the automatic cleaning device on the high-voltage coil immediately, after the cleaning time is T4, the real-time humidity of the insulating sleeve is between the preset first safe humidity W1 and a second safe humidity W2, and taking the transformer where the current high-voltage coil is located as a first output;
when the voltage on the high-voltage coil is a fourth standard voltage U4> U1i at the ith moment, detecting the current real-time temperature T1i of the high-voltage coil, if the real-time temperature is lower than a preset safe temperature TO, starting the automatic cleaning device on the high-voltage coil after T1+ T2+ T3+ T4 time, cleaning an insulation sleeve of the current high-voltage coil, and if the real-time temperature is higher than the preset safe temperature TO, immediately starting the automatic cleaning device on the high-voltage coil, and selecting the current transformer TO work as a zero-th output;
and the central control unit sequentially outputs voltage according to the sequence of the zeroth output, the first output, the second output, the third output and the fourth output.
2. The resin-cast dry-type transformer with a high-voltage coil structure as claimed in claim 1, wherein in use, if the temperature of the transformer with the zeroth output rises TO 1.1 xto after a preset time period of operation, the output of the transformer with the zeroth output is stopped, the real-time humidity of the transformer with the zeroth output is detected, if the real-time humidity is between a preset first safety humidity W1 and a preset second safety humidity W2, the voltage of the transformer with the zeroth output is changed TO the first output, if the real-time humidity is greater than the second safety humidity W2, the voltage of the transformer with the zeroth output is changed TO the second output, and if the real-time humidity is lower than the preset first safety humidity W1, the transformer with the zeroth output is changed TO the third output.
3. The resin-cast dry-type transformer with a high-voltage coil structure as claimed in claim 2, wherein in use, if the temperature of the transformer with the first output rises TO 1.2 xto after a preset time period of operation, the output of the transformer with the first output is stopped, the real-time humidity of the transformer with the first output is detected, if the real-time humidity is between a first safety humidity W1 and a second safety humidity W2, the voltage of the transformer with the first output is changed TO the second output, if the real-time humidity is greater than the second safety humidity W2, the voltage of the transformer with the first output is changed TO the third output, and if the real-time humidity is lower than the first safety humidity W1, the transformer with the first output is changed TO the fourth output.
4. The resin-cast dry-type transformer with a high-voltage coil structure as claimed in claim 3, wherein when the transformer with the second output is operated for a predetermined time, the output of the transformer with the second output is stopped and the real-time humidity of the transformer with the second output is detected if the temperature of the transformer with the second output is increased TO 1.3 xto, if the real-time humidity is between a first safety humidity W1 and a second safety humidity W2, the voltage transformer with the second output is changed TO the third output, if the real-time humidity is greater than the second safety humidity W2, the voltage transformer with the second output is changed TO the fourth output, and if the real-time humidity is lower than the first safety humidity W1, the transformer with the second output is changed TO the fourth output, and the high-voltage coil is a flat enameled copper wire.
5. The resin-cast dry-type transformer with a high-voltage coil structure according to claim 4, wherein the central control unit is connected with the temperature sensor for determining the safety of the transformer according to the real-time temperature of the temperature sensor;
when the transformer with the fourth output is used, if the temperature of the transformer with the fourth output is increased TO 1.6 × TO after the transformer works for a preset time, the output of the transformer with the fourth output is stopped, the real-time humidity of the transformer with the fourth output is detected, if the real-time humidity is between a preset first safety humidity W1 and a preset second safety humidity W2, the voltage device with the fourth output is replaced TO the first output, if the real-time humidity is greater than the second safety humidity W2, the voltage device with the fourth output is replaced TO the second output, and if the real-time humidity is lower than the preset first safety humidity W1, the transformer with the fourth output is replaced TO the third output.
6. The resin-cast dry-type transformer provided with a high-voltage coil structure as claimed in claim 5, wherein the high-voltage coil has a number of turns of 50, the insulating sleeve is a resin-cast layer, and the low-voltage coil is formed by a foil winding.
7. The resin-cast dry-type transformer provided with a high-voltage coil structure according to any one of claims 1 to 6, wherein the low-voltage coil has 20 turns.
8. The resin-cast dry-type transformer provided with a high-voltage coil structure according to claim 7, wherein a layer pitch of the high-voltage coil is smaller than a layer pitch of the low-voltage coil.
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| JPH09283274A (en) * | 1996-04-17 | 1997-10-31 | Matsushita Electric Ind Co Ltd | High frequency heating cooker |
| US8522626B2 (en) * | 2011-04-04 | 2013-09-03 | Weidmann Electrical Technology Inc. | Clamping force sensor assembly for monitoring transformer degradation |
| JP5903072B2 (en) * | 2013-05-30 | 2016-04-13 | 株式会社沖データ | High voltage power supply system and image forming apparatus |
| CN104166413A (en) * | 2014-08-28 | 2014-11-26 | 杭州鸿程科技有限公司 | Dry type transformer temperature controller and control method thereof |
| CN207069921U (en) * | 2017-03-29 | 2018-03-02 | 珠海金萝卜智动科技有限公司 | New type multipath output universal test bench test power supply |
| CN107195444A (en) * | 2017-07-31 | 2017-09-22 | 国网上海市电力公司 | Dry type auto-transformer |
| CN108988490A (en) * | 2018-07-04 | 2018-12-11 | 安徽迪康电力科技有限公司 | A kind of box type transformer remote monitoring system |
| CN108922729A (en) * | 2018-07-11 | 2018-11-30 | 太仓煜和网络科技有限公司 | A kind of automatic detection cleaning equipment of for transformer |
| CN108803704B (en) * | 2018-07-26 | 2020-12-18 | 陕西金源自动化科技有限公司 | Controller of transformer cooler and control method thereof |
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